Valve



l J. W. OVERBEKE VALVE July 30, 1940.

Filed July 13, 1939 2 Sheets-Sheet l i Moana/w v n ing 2 is thereforesupplied with two ports 4 which pressure ud in the central portion ofthe Sleeve, 4o

Patented July 30, 1940 l V v r f l 8.

-UNITED STATI-:s PATENT. oFFlcEq" John W. Overbeke, Anneslie, Md.,assgnor to The Glenn L. Martin Company,- Baltlmore, Md.

ApplicationvJuly 13, 1939, Serial N0. 284,277 2 Claims. (Cl. .2M- 76)The invention relates to` valves and particularly municate with theinterior of the sleeve.` A port -to metering valves especially intendedfor the I8 connects the chamber I0 with the central porcontrol ofhydraulic devices. tion of the sleeve. Ports 28, which connect the Theprimary object of the invention is to prochambers 8 to the interior ofthe sleeve, are arvide a valve of this type which can be operated rangedas metering ports, being of elongated by a very small force appliedthereto, even though tapered shape of increasing Width outwardly tothevalve is used to control uids under very high wards the ends of thesleeve.

pressures, the force required being independent 'I'he ends of bore 5communicate through a of the pressure. passage 22 with a dischargeoutlet 24 which may l A second object is to provide a. balanced valve beconnected to the source from which the l0' which can thusbe movedeasily. pump draws the fluid.

Still another object is to provide avalve having Slidable in the sleeve9 is a movable valve centering means which move the valve to a cenmemberhaving a stem portion 26 of less diamtral closed position,these meansbeing of simple eter than the sleeve located between two enconstructionbecause of the small force required larged portions 28. These enlargedportions overll5 to move the valve. lie and close the ports 28 in thenormal -posi- A further object of the invention gis to provide tion,shown in the'drawings. a valve of this type with meteringl means whichThe valve member is normally held in the cencontrol the pressure linequite exactly, While protered position shown by the centering means'lonviding an ample opening for the return line. cated at the right of Fig.2. The valve has a I0 Another object of the invention is to provide stem30' which carries a pin 32 engaged in a fork a structure so arranged asto make replacement in theend of lever 34 mounted non-rotatablyr of theessential valve parts easy. on e turntable shaft 38. This shaft extendsout- Further objects and advantages of the invenside the casing and isprovided with a wheel 38 tion will appear more fully from the followingby which it may be turned to move the valve 85 description, particularlywhen taken in conjuncmember.

tion with the accompanying drawings which form Lever 34 extends into anupward projection 40 a part thereof. of casing 2 which is providedwithopposed cylin- In the drawings: drical members 42. Slidable in members42 are W Fig. 1 shows the valve in side elevation; cups 44, betweenwhich is located a stop 46 so 80 Fig, 2 is a vertical cross sectiontherethrough; as to limit movement of the cups toward each Fig. 3 is ahorizontal cross section on the linev other. Between cups 44 isarrangedan upward 3-3 of Fig. 1; and extension 48 of lever 34, so that the'cupsboth Fig. 4 is a cross section on the line 4 4. of engage the lever whenthe valve is in normal 85 Fig. 2. Y position. Coil springs 58 arrangedin the cylinas The invention is particularly intended for the dricalportions 42 extend into the cups 44 and control-of a hydraulic cylinder,to opposite `ends press them against lever extension 48. A l of whichpressure fluid is to be selectively sup- The operation 'of the valve isas follows: When plied to move a piston therein. The valve casthe partsare in the neutral positionj shown,

are to be connected to opposite ends of the cylinsupplied by inlets 5and I8, is ineffective because der. These ports communicate with alongituthe outlets 20 are closed by portions 28. Since dinal bore 5 on'opposite sides of the inlet port' 6 the pressure is exerted equallyinboth directions which is to be connected to a source of uid on thevalve member, it will have no tendency 45 under pressure. to move andthe centering means will prevent 45' A hollow sleeve 9 is arranged inthe borev 5. any movement which might be caused by sudden This sleevehas projections cooperating with the ShOCkS eXerted thereon.

bore walls to form three separate annular cham- Assuming that the Wheel38 iS turned s0 as to ber 8, 8 and I0 opposite the ports 4, 4 and 6remove the lever 34 in one direction,.say clockwise spectively.'Suitable sea1ing`rings such as I2 (Fig. 2), the movable valve memberwillA move 50 make these chambers uid-tight. The whole to the left. Thiswill uncover the righthand A sleeve is held inr position by resilientsnap rings end of each of openings 28. Fluid .will ow I4 at its ends,and can be removed from casing from inlets 8, I8 to the left opening 20;which is 2 through plugs I6 at the ends of bore 5. of small width sothat the ilow of iluid will be The three annularchambers 8, 8 and I0comslight. 'I'he right-hand opening, of which the 86 part of greatestwidth is uncovered, will communicate through passage 22 with discharge2l. Thus the return-passage i'or uid will be greater than the supplypassage, which favoids any danger of blockingy the movement to be causedby the pressure fluid. During all such movement, the pres.

wnue 1 navevdescnbed herein one ,embodiment of my invention, I wish itto'- be understood that 20 I do not intend to limit myself therebyexcept withinthe scope of the appended claims.

I claim:

A1. A valve comprising a cylindrical guide, said guide having an inletthereinto, and pair oi' zo outlets arranged on opposite sides of saidinlet,

a valve member slidable in said guide and having spaced enlargedportions normally closing said outlets, the portion between saidenlarged portions being of less diameter so as to provides.

space opposite said inlet. discharge means communicating with the endsof said guide member outside of said enlarged portions, and centeringmeans for' normally holding said slidable valve member in a position toclose both said outlets, said centering means comprising a pivoted leverhaving a pivotal connection with said slidable valve member, slidablemembers' normally engaging a portion of said lever, means to limit themovement of said slidable members against said lever to a positioncorresponding to the centered position Iof said movable valve member,and spring means urging said slidable members against said lever.

2. In a valve comprising a-,cylindrical guide and a valve memberslidable in said guide, centering means for normally'holding saidslidable valve member in a predetermined position, said centering meanscomprising a` pivoted lever having a' pivotal connection with saidslidable valve member, slidable members normally en'- gaging a portionof said lever, means to limit the movement of said slidable membersagainst said lever to the position corresponding to the predeterminedposition or said movable valve member, and spring means urgingsaidslidable members against said lever.

JOHN W. OVERBEKE.

